Electron flux images of each event, in the representative 18-20 keV energy channel, are shown in Figure REF . These images were produced by performing a spectral inversion on the count visibility data to obtain the corresponding electron visibilities and then using the uv-smooth algorithm [1]} to produce maps of the electron flux [2]}. Two aspects of this technique are worthy of note. First, the technique exploits the fact that for the bremsstrahlung process counts of energy \(q\)  are produced by all electrons with energy \(E \ge q\) , so that the method yields images at electron energies \(E\)  up to and beyond the maximum count energy \(q_{\rm max}\)  observed. Second, the regularized spectral inversion procedure that produces the electron visibilities results in images that, by construction, vary more smoothly with electron energy \(E\)  than the “parent” count images vary with \(q\) . This smooth variation with \(E\)  greatly facilitates the analysis of the following section.
